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d-wave superconductivity from electron-phonon interactions

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journal contribution
posted on 2006-05-03, 17:03 authored by J.P. Hague
I examine electron-phonon mediated superconductivity in the intermediate coupling and phonon frequency regime of the quasi-two-dimensional Holstein model. I use an extended Migdal-Eliashberg theory that includes vertex corrections and spatial fluctuations. I find a d-wave superconducting state that is unique close to half filling. The order parameter undergoes a transition to s-wave superconductivity on increasing filling. I explain how the inclusion of both vertex corrections and spatial fluctuations is essential for the prediction of a d-wave order parameter. I then discuss the effects of a large Coulomb pseudopotential on the superconductivity (such as is found in contemporary superconducting materials like the cuprates), which results in the destruction of the s-wave states, while leaving the d-wave states unmodified.

History

School

  • Science

Department

  • Physics

Pages

171696 bytes

Citation

HAGUE, J.P., 2006. d-wave superconductivity from electron-phonon interactions. Physical Review B, 73(6), 060503

Publisher

© American Physical Society

Publication date

2006

Notes

This article has been published in the journal, Physical Review B [© American Physical Society]. It is also available at: http://link.aps.org/abstract/PRB/v73/e060503.

ISSN

1098-0121

Language

  • en

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